P Charts

This document discusses p-charts, which are a type of control chart used in statistical process control (SPC) as part of total quality management (TQM) systems. P-charts use control limits to monitor the proportion of defects in samples from a production process. The document provides the statistical formulas for calculating the upper and lower control limits of a p-chart based on a sample proportion and size. It also gives an example of constructing a p-chart using data from 20 samples of 200 items each, plotting the results to check if the production process is out of control at any point.